{
  "openwall": "0.1-draft",
  "id": "urn:uuid:94d908df-2876-48f1-bec8-c931f5c847d4",
  "sender": "did:web:ops.example",
  "createdAt": "2026-09-13T12:00:00Z",
  "expiresAt": "2026-09-13T12:10:00Z",
  "visibility": "private",
  "topic": "maintenance",
  "audience": {
    "kind": "relationships",
    "selectors": [
      {
        "source": "https://dev.example/contacts",
        "actor": "did:web:ops.example",
        "groups": [
          "users"
        ],
        "scope": "https://dev.example/workspaces/main"
      }
    ],
    "exclude": []
  },
  "content": {
    "mediaType": "text/plain",
    "text": "SERVER NOTICE\nMaintenance starts in 10 minutes.\nPlease save your work and pause running jobs."
  }
}